Versatile Surface Modification of TFC Membrane by Layer-by-Layer Assembly of Phytic Acid–Metal Complexes for Comprehensively Enhanced FO Performance,Environmental Science & Technology

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Versatile Surface Modification of TFC Membrane by Layer-by-Layer Assembly of Phytic Acid–Metal Complexes for Comprehensively Enhanced FO Performance
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2019-03-07 , DOI: 10.1021/acs.est.8b06628
Shu Xiong ₁ , Sheng Xu ₁ , Anny Phommachanh ₁ , Ming Yi ₁ , Yan Wang _{1,

2}

Affiliation

Polyamide TFC membranes are widely applied in membrane-based water treatment but generally suffer various fouling problems. In this work, the layer-by-layer assembly of phytic acid (PA) and metal ions (M) is constructed on the surface TFC membrane for the first time, to improve the bio/organic fouling resistances and separation performance of TFC membranes simultaneously. The PA molecule with six phosphonic acid groups of strong chelation ability acts as the organic ligand, and the metal ion acts as the inorganic cross-linker, inducing the assembly of hydrophilic and antibacterial PA-M (Ag or Cu) complexes on the TFC membrane surface. Various characterizations including FTIR, XPS, SEM, AFM, and EDX are employed to confirm the successful and uniform modification of PA-M. FO performance of the PA-M modified TFC membranes, i.e., TFC_PA-Ag and TFC_PA-Cu, is optimized by varying PA concentration and assembly cycles, where the water flux can be improved by 57% and 68%, respectively, without compromising the membrane selectivity. Additionally, the PA-M modification improves the biofouling and organic fouling resistances of the TFC membrane remarkably, owing to the enhanced antibacterial ability and hydrophilicity. The modified TFC membranes are also proven to show the excellent stability by the quantitative release test.

中文翻译：

植酸-金属配合物的逐层组装对TFC膜的多功能表面改性，以全面提高FO性能

聚酰胺TFC膜广泛用于基于膜的水处理中，但通常会遇到各种结垢问题。在这项工作中，首次在表面TFC膜上构建了植酸（PA）和金属离子（M）的逐层组装，以同时提高TFC膜的抗生物/有机污染性和分离性能。具有六个螯合能力强的膦酸基团的PA分子充当有机配体，金属离子充当无机交联剂，从而导致亲水性和抗菌性PA-M（Ag或Cu）复合物在TFC膜上组装表面。包括FTIR，XPS，SEM，AFM和EDX在内的各种特性被用于确认PA-M的成功和统一改性。PA-M改性TFC膜的FO性能，即通过改变PA的浓度和组装周期来优化TFC_PA-Ag和TFC_PA-Cu，在不影响膜选择性的情况下，水通量可以分别提高57％和68％。此外，由于增强的抗菌能力和亲水性，PA-M改性显着提高了TFC膜的抗生物结垢性和有机结垢性。改性的TFC膜还通过定量释放测试证明具有出色的稳定性。由于增强了抗菌能力和亲水性。改性的TFC膜还通过定量释放测试证明具有出色的稳定性。由于增强了抗菌能力和亲水性。改性的TFC膜还通过定量释放测试证明具有出色的稳定性。

更新日期：2019-03-09

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